Career
She went on to have a substantial opera and concert career in North America from the late 1920s through the 1950s. She was also a regular soloist with the Philadelphia Orchestra during the 1930s in concerts of operatic works and in works from the standard concert repertoire, a collaboration which resulted in several recordings. Outside of Philadelphia, Eustis performed with opera companies in New York City, Detroit, Chicago, Boston, and New Orleans among others
She also sang with many of the leading orchestras in the United States, including the New York Philharmonic, the Boston Symphony Orchestra, the Cleveland Orchestra, and the Chicago Symphony Orchestra.
During World World War II, she traveled around the world performing in more than a 1,000 United Service Organizations concerts. She retired from her performance career in the late 1950s.
After the end of the War, Eustis devoted much of her time and interests towards the study of "music therapy", a term that wasn"t even in wide use yet at that time. In the late 1940s, she undertook a pioneering project at a Long Island hospital to explore the therapeutic role music could play in treating the mentally illinois
She continued to work actively as a music therapist for many years, and eventually became a highly respected educator within the field
An annual scholarship in her name is offered by the American Music Therapy Association. She died in Southbury, Connecticut at the age of 88.